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What is the major difference between Facilitated diffusion and Passive diffusion?

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What is the major difference between Facilitated diffusion and Passive diffusion?

(a) Carrier-mediated transport

(b) Downhill transport

(c) Energy is used

(d) Inhibition by metabolic poisons

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I'm obligated to ask this question of Mechanisms of Drug Absorption topic in division Absorption of Drugs of Drug Biotechnology

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Right choice is (a) Carrier-mediated transport

For explanation: Facilitated diffusion is a carrier-mediated transport which operates down the concentration gradient. It is faster than passive diffusion because of the involvement of Carriers. The driving force is the concentration gradient.

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